Cita APA (7a ed.)

Elton, B., & Zerning, H. (1997). Popcorn. Ahn & Simrock.

Cita Chicago Style (17a ed.)

Elton, Ben, y Heidi Zerning. Popcorn. München: Ahn & Simrock, 1997.

Cita MLA (8a ed.)

Elton, Ben, y Heidi Zerning. Popcorn. Ahn & Simrock, 1997.